Police uncovered a cannabis farm when they acted on a tip off about illegal immigrants.
Officers from the Central neighbourhood police team (NPT) and staff from the UK Border Agency went to a house on Berners Street, Wakefield, on Tuesday night.
When they knocked on the door two men were seen fleeing from the house. One of the men was caught but the other managed to escape.
Inside the house officers found 100 cannabis plants growing. Each plant can be worth an estimated £300 each when sold on the streets.
The man who was caught was in the country legally and is not wanted for immigration offences. Police are still trying to trace the second man.
Sgt Mark Beet, of the Central NPT, said: “I would urge anyone with information about anyone who may be growing cannabis to get in touch with the NPT.
“We will not tolerate people profiting from illegal drugs in out community and will always act on intelligence.”
Anyone with information should contact the Central NPT on 101. Alternatively call Crimestoppers on 0800 555111.